D-Net

#1019 introducing integration test

#919 introducing integration test input and output

#919 introducing integration test containing empty input and output

#919 introducing project to concept transformer module

#1019 introducing PIG module transforming pmc ingested metadata into common extracted document metadata

#963 propagating dataset -> mdstore from import to exporting phase: importer produces DocumentToMDStore datasetore utilized by exporter module. Updating transformer definition to handle DocumentToMDStore instead of Identifier schema

#913 renaming DocumentContentUrl#contentSize to DocumentContentUrl#contentSizeKB changing field type from int to long, importing content size from ObjectStoreFile#fileSizeKB, updating dnet-objectstore-rmi dependency from 1.0.0 to 2.0.1-SNAPSHOT

#913 supplementing json files with newly introduced DocumentContentUrl#contentSize field value set to null

#913 introducing DocumentContentUrl#contentSize field, handling it properly in all PIG transformers

#840 moving IdentifierMapping from importer to common package